Another mailbox-store database for information on voice messages that are saved in that mailbox store. The database is presized for an average of approximately 40 messages each for 10,000 users, or about 1.25 GB. (The database application currently being used for Connection cannot dynamically resize a database after it is created.)

The 1.25 GB mentioned in the excerpt is used for table rows in order to store maps to the user messages that are stored elsewhere on UC; it does not refer to the size of the database that is used in order to store user messages.